package basics.files;

import java.io.*;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.filechooser.*;

/*
 * FileChooserDemo.java uses these files:
 *   images/Open16.gif
 *   images/Save16.gif
 */
public class FileChooserDemo extends JPanel
                             implements ActionListener {
    static private final String newline = "\n";
    JButton openButton, saveButton;

    
    
    
    JTextArea log;
    JFileChooser fc;
    boolean done = false;

    public FileChooserDemo() {
        super(new BorderLayout());

        //Create the log first, because the action listeners
        //need to refer to it.
        log = new JTextArea(5,20);
        log.setMargin(new Insets(5,5,5,5));
        log.setEditable(false);
        JScrollPane logScrollPane = new JScrollPane(log);

        //Create a file chooser
        fc = new JFileChooser();

        //Uncomment one of the following lines to try a different
        //file selection mode.  The first allows just directories
        //to be selected (and, at least in the Java look and feel,
        //shown).  The second allows both files and directories
        //to be selected.  If you leave these lines commented out,
        //then the default mode (FILES_ONLY) will be used.
        //
        //fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        //fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

        //Create the open button.  We use the image from the JLF
        //Graphics Repository (but we extracted it from the jar).
        openButton = new JButton("Open a File...");
        openButton.addActionListener(this);

        //Create the save button.  We use the image from the JLF
        //Graphics Repository (but we extracted it from the jar).
        saveButton = new JButton("Save a File...");
        saveButton.addActionListener(this);

        //For layout purposes, put the buttons in a separate panel
        JPanel buttonPanel = new JPanel(); //use FlowLayout
        buttonPanel.add(openButton);
        buttonPanel.add(saveButton);
        
        openButton.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        openButton.setToolTipText("Open a file.");
        saveButton.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        saveButton.setToolTipText("Save a file.");
        saveButton.setRolloverEnabled(true);
        
        saveButton.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseEntered(java.awt.event.MouseEvent evt) {
                saveButton.setBackground(Color.GREEN);
            }
            public void mouseExited(java.awt.event.MouseEvent evt) {
                saveButton.setBackground(UIManager.getColor("control"));
            }
        });


        //Add the buttons and the log to this panel.
        add(buttonPanel, BorderLayout.PAGE_START);
        add(logScrollPane, BorderLayout.CENTER);
    }

    public void actionPerformed(ActionEvent e) {

        //Handle open button action.
        if (e.getSource() == openButton) {
            int returnVal = fc.showOpenDialog(FileChooserDemo.this);

            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                //This is where a real application would open the file.
                log.append("Opening: " + file.getName() + "." + newline);
            } else {
                log.append("Open command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());

        //Handle save button action.
        } 
        else if (e.getSource() == saveButton) {
        	
        	done = false;
        	
			//Set done to true when cancel is pressed
			fc.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent evt){
				String command = evt.getActionCommand();
				if(command.equals(JFileChooser.CANCEL_SELECTION)){
				System.out.println("Cancel was pressed");
				done = true;
				}
				}
				});
			while(!done)
			{
            int returnVal = fc.showSaveDialog(FileChooserDemo.this);
            
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                String outputDirectory=fc.getSelectedFile().getParent();
				String filename = file.getName();
				
				int res=0;
				if(isFileExists(outputDirectory,filename)){
					res = JOptionPane.showConfirmDialog(null,
            			"This file already exist, would you like to replace it?",
            			"Save Confirmation",
            			JOptionPane.YES_NO_OPTION,
            			JOptionPane.QUESTION_MESSAGE);
					}
				
				if(res==JOptionPane.YES_OPTION || res ==0)//if res is 0, then the file does not exist yet
				{
				//SaveTable st = new SaveTable(outputDirectory, file.getName(),this.tableDatabase.get(this.tab.getSelectedIndex()));
				//st.start();
				done = true;
				}
				
                //This is where a real application would save the file.
                log.append("Saving: " + file.getName() + "." + newline);
            } else {
                log.append("Save command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());
        }
        }
    }
    
  //Check if the file is already exists in the directory
	public boolean isFileExists(String dir, String filename)
	{
	    File folder = new File(dir);
	    File[] listOfFiles = folder.listFiles();

	    for (int i = 0; i < listOfFiles.length; i++) {
	    	  if(listOfFiles[i].getName().equals(filename))
	    		  return true;
	    }
	    
		return false;
	}

    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = FileChooserDemo.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event dispatch thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("FileChooserDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add content to the window.
        frame.add(new FileChooserDemo());

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //Turn off metal's use of bold fonts
                UIManager.put("swing.boldMetal", Boolean.FALSE); 
                createAndShowGUI();
            }
        });
    }
}
